Wildfly: Address GitHub issues

Update Wildfly project demo site to address the list of GitHub issues:

• [x] Add an instructional page for developing this site #21: https://github.com/jbossorg/wildflysite/issues/21
• [x] Not enough color contrast #23: https://github.com/jbossorg/wildflysite/issues/23
• [x] The boxes feel a bit hard to read #14: https://github.com/jbossorg/wildflysite/issues/14
• [x] Dowloads page - Final/Beta/CR1 options too close each other #4: https://github.com/jbossorg/wildflysite/issues/4
• [x] Rethink the "Translate into your language" item #24: https://github.com/jbossorg/wildflysite/issues/24
• [x] Add an RSS feed #35: https://github.com/jbossorg/wildflysite/issues/35
• [x] Links to hipchat as chat system #9: https://github.com/jbossorg/wildflysite/issues/9
• [x] Outdated 'Find More' content in the footer #20: https://github.com/jbossorg/wildflysite/issues/20
• [x] Forum links are outdated #33: https://github.com/jbossorg/wildflysite/issues/33
• [x] URLs for existing 'news' / 'blog' articles are changed #34: https://github.com/jbossorg/wildflysite/issues/34
• [x] Outdated dowload and news ? #15: https://github.com/jbossorg/wildflysite/issues/15
• [x] Website update for new version #22: https://github.com/jbossorg/wildflysite/issues/22
• [x] Drop the unused docs code #28: https://github.com/jbossorg/wildflysite/issues/28